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Pulse radiolysis study of CF3CCI2 and CF3CCI2O2 radicals in the gas phase at 295K

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The ultraviolet absorption spectra and self reaction kinetics of CF3CCI2 and CF3CCI2O2 radicals have been studied in the gas phase at 295K. Absorption cross sections were quantified over the wavelength range 220-300 nm. Measured cross sections near the absorption maxima were γCF3CCI2(230 nm) = (9.70 ± 1.47) x 10-18 and γCF3CCI2O2(250 nm) = (1.70 ± 0.26) x 10-18 cm2 molecule-1. Errors are statistical (2γ) together with our estimate of potential systematic errors. Rate constants for the self reaction of CF3CCI2 and CF3CCI2O2 radicals were measured to be k6 = (2.46 ± 0.43) x 10-12 and k7obs = (3.33 ± 0.53) x 10-12 cm3 molecule-1 s-1, respectively. Results are discussed with respect to the existing database concerning halogenated peroxy radicals.

OriginalsprogEngelsk
TidsskriftResearch on Chemical Intermediates
Vol/bind20
Udgave nummer3-5
Sider (fra-til)265-276
Antal sider12
ISSN0922-6168
DOI
StatusUdgivet - 1 jan. 1994

ID: 228192823